summaryrefslogtreecommitdiffhomepage
path: root/src/timer-ns.cpp
blob: a940e1f5988e32be3b41bdb9478559ae3a403e81 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
#include "timer.hpp"
#include "compat/assert.hpp"

namespace floormat {

namespace {

#if 1
constexpr auto MAX = (uint64_t)-1, HALF = MAX/2;

static_assert(MAX - (MAX-0) <= 0);
static_assert(MAX - (MAX-1) <= 1);
static_assert(MAX - (MAX-2) <= 2);

static_assert(HALF + HALF + 1 == MAX);;
static_assert(MAX - HALF <= HALF+1);

//static_assert(MAX - (MAX-1) <= 0); // must fail
//static_assert(MAX - (MAX-2) <= 1); // must fail
//static_assert(MAX - HALF <= HALF); // must fail

#endif

} // namespace

Ns operator+(const Ns& lhs, const Ns& rhs)
{
    constexpr auto max = (uint64_t)-1;
    auto a = lhs.stamp, b = rhs.stamp;
    fm_assert(max - a <= b);
    return Ns{a + b};
}

Ns operator-(const Ns& lhs, const Ns& rhs)
{
    auto a = lhs.stamp, b = rhs.stamp;
    fm_assert(a >= b);
    return Ns{a - b};
}

Ns operator*(const Ns& lhs, uint64_t b)
{
    auto a = lhs.stamp;
    auto x = a * b;
    //fm_assert(!(a != 0 && x / a != b));
    fm_assert(a == 0 || x / a == b);
    return Ns{a * b};
}

uint64_t operator/(const Ns& lhs, const Ns& rhs)
{
    auto a = lhs.stamp, b = rhs.stamp;
    fm_assert(b != 0);
    return a / b;
}

Ns operator%(const Ns& lhs, uint64_t b)
{
    auto a = lhs.stamp;
    fm_assert(b != 0);
    return Ns{a % b};
}

bool operator==(const Ns& lhs, const Ns& rhs)
{
    auto a = lhs.stamp, b = rhs.stamp;
    return a == b;
}

std::strong_ordering operator<=>(const Ns& lhs, const Ns& rhs)
{
    auto a = lhs.stamp, b = rhs.stamp;
    return a <=> b;
}

Ns::operator uint64_t() const { return stamp; }
Ns::operator float() const { return float(stamp); }
uint64_t Ns::operator*() const { return stamp; }

} // namespace floormat